Simaudio MOON Voice 22 Loudspeaker Lab Report

Lab Report

Measured on the tweeter axis, MOON's inaugural Voice 22 standmount offers a slightly bumpy forward response trend with a boosted lower midrange prior to a 5.5dB dip near the 1.5kHz crossover, possibly the result of a cone/surround mistermination [see Graph 1 and resonance on Graph 2, below]. This also draws out the response error(s) to ±3.1dB (200Hz-20kHz), although as this occurs in both samples, the pair matching remains a superbly tight 0.35dB from 200Hz-13kHz (or 0.9dB, 200Hz-20kHz). Furthermore, distortion is very low at ~0.1% through this midband region (re. 90dB SPL/1m). While the grille brings some 1.8dB of variation through the presence region [blue trace] the quality of the soft dome tweeter is realised in the HF response which extends out to ~41kHz [–6dB re. 10kHz; pink shaded area, Graph 1]. As for its low-end reach, the 155mm woofer's 64Hz-1.01kHz (–6dB) bandpass is reinforced by the 24Hz-90Hz (–6dB) output of the rear-firing port to better Simaudio's 55Hz specification with a solid 47Hz extension (–6dB re. 200Hz).

All this adds up to a 90.2dB/2.83V/1m sensitivity, boosted by the lift in response at 1kHz, and a lower but more representative 88.4dB from 500Hz-8kHz. This is achieved with a tougher load than many contemporary standmounts, dipping to 3.5ohm/185Hz following large swings in impedance phase, all at low bass frequencies, of –57°/88Hz/10.7ohm and +54°/21Hz/10.6ohm. Aside from a gentle 'bump' at 1-2kHz the impedance is sub-8ohm from 100Hz-13kHz, the nominal a low 4ohm and the EPDR a punishing 1.6ohm/117Hz, so the Voice 22 is best partnered with fairly beefy amps. PM


Response inc. nearfield summed driver/port [green], freefield corrected to 1m at 2.83V [yellow], ultrasonic [pink]. Left, black; right, red; w. grille, blue


Treble and cabinet modes are well suppressed but a resonance at its ~1.5kHz crossover is indicated

Sensitivity (SPL/1m/2.83V – 1kHz/Mean/IEC) 90.2dB / 88.4dB / 86.0dB
Impedance modulus: minimum & maximum (20Hz–20kHz) 3.5ohm @ 185Hz 28ohm @ 76Hz
Impedance phase: minimum & maximum (20Hz–20kHz) –57° @ 88Hz +54° @ 21Hz
Pair matching/Resp. error (200Hz–20kHz) 0.9dB/ ±3.1dB/±3.0dB
LF/HF extension (–6dB ref 200Hz/10kHz) 47Hz / 41.1kHz/40.5kHz
THD 100Hz/1kHz/10kHz (for 90dB SPL/1m) 0.55% / 0.09% / 0.7%
Dimensions (HWD) / Weight (each) 350x200x290mm / 11kg
Price £2650 (£495 for the 'Stand 22' stands)

Simaudio Ltd
Quebec, Canada
Supplied by: Renaissance Audio, Scotland
0131 555 3922